<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="http://www.baidu.com">
    <!--maxlength最大字符长度
    value 设置默认值
    placeholder占位文本
    readonly只读-->
    用户名:<input type="text" name="username" maxlength="5"
               placeholder="请输入用户名" value="tom" readonly><br>
    密码:<input type="password" name="password"><br>
    <!--checked设置选中 value必须写否则提交on-->
    性别:<input type="radio" name="gender" value="m" id="r1">
    <label for="r1">男</label>
    <input type="radio" name="gender" checked value="w" id="r2">
    <label for="r2">女</label><br>
    <!--多选框的属性和单选框的通用-->
    兴趣爱好:<input type="checkbox" name="bobby" value="cy">抽烟
    <input type="checkbox" checked name="bobby" value="hj">喝酒
    <input type="checkbox" name="bobby" value="tt">烫头<br>
    生日:<input type="date" name="birthday"><br>
    靓照:<input type="file" name="pic"><br>
    所在地:<select name="city">
    <!--如果没有value则提交标签体的内容-->
    <option value="bj">北京</option>
    <option selected value="sy">沈阳</option>
    <option value="sh">上海</option>
</select>
    <br>
    <input type="submit" value="注册">
    <input type="reset" >
    <input type="button" value="按钮">
    <button type="submit">注册</button>
    <button type="reset">重置</button>
    <button type="button">按钮</button>
</form>
</body>
</html>